Hey, how about a green approach?! Try to harvest the water by means of a water barrell. Could you collect the water from a downspout that drains to the affected area, thus reducing the amount of water in your yard? With the collected water you could get your garden or shrubs a much needed drink after a rainless period or even set up a drip irrigation system. Why spend your time and money digging ditches and building drywells when you could keep the water and save money?